Die-casting machine



Nov. 11, 1930. E DOLLIN ET AL DIE CASTING MACHINE 8 Sheets-She et 1Filed Feb. 23, 1928.

TTOIRIVEY Nov. 11, 1930. E DOLUN ETAL 1,781,168

DIE CASTING MACHINE Filed Feb. 2:5, 192s a Sheets-Sheet 5 Ill/VENT R3Nov. 11, 1930. E, N, DOLUN ET AL 1,781,168

DIE CASTING MACHINE Filed Feb. 25, 1928 8 Sheets-Sheet 4 B Z Z ATT RIVEYNOV. 11, 1930. DOLLIN ET AL 1,781,168

DIE CASTING MACHINE Filed Feb. 23, 1928 8 Sheets-Sheet 5 m BY 19% .www

ATTO IVEY E. N. DQLLIN ET AL 1,781,168

DIE CASTING MACHINE I Fil ed Feb. 23, 1928 a Sheets-Sheet. 6

Nov. 11, 1930.

.8 i r i P DIE CASTING MACHINE Filed Feb. 23, 1928 8 Sheets-Sheet 7 A T(IR/VEY NOV. 11, 1930. N, DOLLINETAL 1,781,168

' DI P CASTING MACHINE Fil ed Feb. 25, 1928 s Sheets-Sheet 8 FatentedNov. 11, 1930 PATENT OFFICE EDGAR N. DOLLIN, OF MALBA, NEW YORK, ANDCONRAD C. JACOBSON, OF GLEN RIDGE,

NEW JERSEY; SAID JACOBSON ASSIGNOR TO JOHN ROBERTSON CO., INC., OFBROOK- LYN, NEW YORK, A CORPORATION OF NEW YORK, AND SAID DOLLINASSIGNOR TO ALLIED DIE-CASTING CORPORATION, OF LONG ISLAND CITY, NEWYORK, A COR- PORATION Application filed February 23, 1928. Serial No.256,302.

This invention has reference to die casting machines and particularlyrelates to that type of machine in which the metal is forced into thedie by a charge of fluid under high compression. In using machines ofthis character, the different operations employed, for the completeproduction of the casting, are performed by hand; but, due to the factthat compressed air is utilized to force themetal into the die, greatcare must beexercised to properly position and control the parts orserious accident will result.

Among the objects of our invention may be noted the following: Toprovide a machine which is largely automatic in its operation, and onein which a maximum of safety and accuracy are provided; to providea'machine wherein the executive or functional parts of the machine areactuated by fluid means; to provide means such that the parts must be intheir proper position before themetal is forced into the die; to provideautomatic means by which the interacting mechanisms and their componentparts are activated under perfect control to bring about accuracy ofoperation, eliminate the element of accident to operatives, and insurethe production of perfect castings.

With the foregoing objects in view and others which will be set forth indetail during the course of this description, our invention consists inthe parts, features, elements and combinations thereof hereinafterdescribed and claimed.

In order that our invention may be clearly understood, we have provideddrawings wherein:

Figure 1 is a view in side elevation of a machine, with parts brokenaway for clearness of illustration and parts in section, embodying ourinvention;

Figure 2 is a top plan view, the shaft carrying the handle for thecontrol member being broken away and the handle being in section;

Figure 3 is a transverse sectional view on a larger scale, taken on line3-3 of Figure Figure 4 is a longitudinal sectional view, on a largescale, through the charging end of the machine, the view being taken onthe line of Figure 2; v

Figure 5 is a central, longitudinal sectional view through that part ofthe machinery housing supporting the fluid actuating means for advancingand retracting the sliding die-plate and the intensifying means, thesection being taken on line 55 of Figure 2;

Figure 6 is a detail sectional view, on a largescale, of the controlmeans, the section being taken on line 6-6 of Figure 8;

Figure 7 is a detail sectional view taken on line 77 of Figure 6; and

Figure 8 is a detail sectional lan View of the parts ShOWD lIl Figures 6an 7, the view being taken on line 8-8 of Figure 6.

Referring to the drawings, the numerals 1O and 11 designate the frameparts of the machine, connected together by members 12.

The frame part or support carries the metal pot 13, and any suitable gasor electric heating means, not shown, occupies the space 14 under saidpot. A metal charging trap or goose-neck 15 is adapted to be raised andlowered into said pot to be charged with molten metal. Fluid actuatedmeans are provided for raising and lowering the gooseneck, as follows: W

A. hook portion 16 of the gooseneck is su ported on a yoke 17, the twolegs of the yo e bein pivoted in bearing 18 at opposite sides of t eframe 10. The opposite end of'the gooseneck has a slotted arm 19, theslot or bifurcation receiving a pin 20 carried by arms 21, which aresecured to'a shaft 22. The shaft 22 is mounted in bearing 23 on a plate24,.slotted at 26, through which bolts 25 pass, said bolts being screwedinto the top of the support 10. Set screws 27 in a flange 28, on theframe 10, bear against the plate 24 for adjustment of the latter. Theshaft22 has secured to its outer end a pinion 29, Figure 4, whichengages a rack 30 on a.

vertical shaft 31. A clutch 32 (Figure 2) may be interposed in the shaft22 so as to allow for slight inaccuracies in lining up or for wearing ofparts. The vertical shaft 31 is supported, for up and down movement, ina bearing 33, which may be integral with or supported by the plate 24'The upper and lower ends of the vertical shaft 31 are reduced of fluidpressure.

in diameter and act as rams and are engaged by the fluid actuatingmeans. Housings or chambers 34 and 35 are provided for the rams ing onthe ram 37, for lowering the goose-- neck is admitted through pipe 42,Which runs directly to the accumulator or source rected to the fact thatthe ram 37 is of considerably less cross-sectional area than the ram 36.The reason for this is that less pressure is required to depress thegooseneck and fluid pressure is always present in chamber 35. When it isdesired to raise the gooseneck, an equivalent amount of. fluid pressureis admitted to the chamber 34 and, due to the greater crossesectionalarea of ram 36, a greater effective area is operated on by the fluidpressure enabling the heavier work of forcing the ram 36 downwardly tobe performed to raise the gooseneck. When it is desired to lower thegooseneck, the control mechanism 41 operates to allow the pressure inchamber 34 to go to a waste line and the ram 37 to be raised, thuslowering the gooseneck. This arrangement makes for great simplicity ofoperation and does away with all valves and controls on the pressureline 42. Stops in the form of nuts 43 and 44,

on shaft 31, are provided for limiting the up and down movements of therams 36 and 37. These stops cooperate with the ends of the bearing 33.-

The gooseneck, as particularly illustrated in Figure 4, is a casting ofsubstantial weight and has a U-shaped chamber 45. One end of thegooseneck has a nozzle 46, and the top has connection with a compressedair supply pipe 47. When the gooseneck is lowered into the pot 13, asindicated in broken lines in Figure 4, the molten metal flows throughthe nozzle 46 into the chamber 45. When the gooseneck is raised, asshown in full lines, it is positioned with its nozzle 46 incommunication with a flared passage 48 of a nipple or fittingsuitably'held in a stationary die-holder 49. The charge of compressedair is then admitted through pipe 47, and the metal in chamber is forcedthrough nozzle 46, passage 48, and into the dies. It isimportant thatthe gooseneck be properly positioned before the compressed air isadmitted. If the nozzle 46 is not accurately positioned in relation tothe passage 48, when the air is admitted, a serious acci- Specialattentionis dident would result because the molten metal, instead ofbeing forced into the dies, would be sprayed all around. Means areprovided, so that the compressed air valve cannot be opened until thegooseneck is properly positioned, as follows:

Attached to shaft 22 is a crank 50 connected by link 51 to pitman 52pivoted at 53 to a valve casing 54. The valve casing 54 houses twovalves 55 and 56. Compressed air is supplied to the casing froma pipe 57which leads to a compressor or other air supply. Valve 55 has aspring-pressed valve stem 58 projecting outside the casing and adaptedto cooperate with an adjustable stop 59 on an operating lever 60, whichis pivoted at- 61 to the valve casing. Valve 56 also has aspring-pressed valve stem 62' projecting out of the casing and adaptedto cooperate with an adjustable stop 63 carried by the lever 60. Valve55 admits the compressed air from line 57 to the casing, and valve 56opens to atmosphere. Pivotally connected to the valve casing 54 and topipe 47 is pipe 64. Thus, when the operating lever is. depressed orpulled down, the stem 58 is lifted and air valve 55 is opened and thestem 62 is depressed and valve56 is closed, thereby connecting theinterior of the gooseneck with the source of compressed air. After themetal has been forced into the dies, the spring 65 raises lever 60 andvalve 56 is opened while valve 55 is allowed to -close, valve 56 actingas a relief valve for pressure in the line 47 64 and interior of thegooseneck, and also acting as a vent to allow the air to escape from thegooseneck when it is again being charged with metal from the pot 13.Pitman 52 carries a stop 66 which engages the end 67 of operating lever60, when the gooseneck is lowered. This of lever 60 until the gooseneckis properly positioned. Thus, the lever 60 cannot be depressed or pulleddown to admit the compressed air until the gooseneck is in its properposition with nozzle 46 in alignment with passage 48 in the nipple.

The stationary die-holder 49, as shown in Figures 1 and 2, carries thestationary die 68, and the sliding die-holder 69 carries the movable die70 and ejector box 71. The stationary die-holder is secured by bolts 72to the frame 10, but may be shifted transversely so as to accuratelyposition it in relation to the gooseneck nozzle and the character ofdies that are being used. The frame-connect ing members 12, as shown inFigures 1 and 4, carry tongue and groove connections 73 for thispurpose. Fluid actuated means are provided for advancing the slidingdie-holder 69 so as to close dies 68 and 70, and said means will now bedescribed.

Mounted on the frame or support 11 is a member 74, between which and thestationary die-plate 49 are four guide-bolts 75, upon which the slidingdie-holder 69 may move back and forth. The bolts are threaded at 76 sothat, when the nuts 77 are loosened, the member 74 may be adjusted so asto allow for more or less movement of the sliding die-plate, dependingupon the thickness of the die. The means for positioning the member 74will be described later. The member 74 has a large central bore 78 toaccommodate the ram 79 for advancing the sliding dieplate. The ram 79might be integral with the sliding die-holder, as illustrated in Figure5, or it might be a'separate member. A

suitable stuffing box and packing 80 are provided at the point where theram enters the bore 78. The fluid operating means is admitted to thebore 78 through pipe 81 which leads to the control means 41. Thus whenthe fluid enters the bore 7 8, it is obvious the sliding die-plate willbe advanced to close the dies. It is very important that the dies beproperly closed and held tightly closed for the same reasons aspreviously explained regarding the gooseneck being properly positioned.One of the most important features of our invention is the means forpositively holding the dies in their closed position. What is termed anintensifying means are utilized for the purpose and said means will now.be described.

Positioned in back of the bore 78 is a plunger or intensifier 82. Afterthe fluid actuated means has moved the ram 79 to position to close thedies, as shown in Figure 1, the control means 41 acts to admit fluidpressure into the chamber 83, through the pipe,

84. This fluid pressure is admitted back of the plunger-head 85, andcauses the plunger or intensifier to enter the bore 78, as shown bydotted lines in Figure 1. This tends *to displace a certain amount offluid in the bore 78; but, due to the fact that the fluid is positivelyheld in the bore 78 by suitable valves, it is further com greatlyincrease thus powerfully holding the dies together so that it isimpossible for the metal to escape when the compressed air forces thesame from the gooseneck into the dies. Suitable ackino' 86, about theplunger and other pac ing 87, about the plungerhead, prevent the escapeof fluid when the in tensifier is being operated. Fluid actuated meansare provided to retract or pull back the sliding die-holder after thecasting has been made or shot, the same including two bores 88, in themember 74, one above and the other below the bore 78 and both of smallerdiameter than the bore 78. A pair of'cylinders 89' are accommodated inthe bores 88 and rods 90 passing through stufling-boxes 91 are connectedat 92 with the sliding die-holder 69. The fluid actuating medium isadmitted to the bores 88 through pipes 93, which are connecteddirect- 1yto the accumulator or source of fluid supressed and the pressure is ply.The cross-sectional area of the ram the cross-sectional area of the rods90, thus giving a greater efiective area for the fluid pressure means tooperate on in the bore 78, and allowing the ram 79 to be advanced whilethe pressure is held in the bores 88. When the bore 78 is opened to thewaste line by the control means 41, the cylinders 89 will operate toretract the sliding die-plate. Thus, there is no necessity for anyvalves or operating connections for the retraction of the slidingdie-plate. v

The control mechanism 41 will now be described. The object of thiscontrol mechanism is to provide a simple means, whereby the operator, bymoving a handle, applies first the fluid actuated means to close thedies,

and then applies the intensifier and raises by the pressure in the maincylinder, forcing it out of said cylinder, the gooseneck will belowered, and the sliding die-holder retracted. The bore 78 is herereferred'to as the main cylinder. mentioned are provided to cooperatewith the control means, so that the intensifier can- Means as previouslynot be applied or the gooseneck raised until the dies have been closed;and means already described are provided so that the air cannot beadmitted to the gooseneck until it is properly positioned. In this way amachine exceedingly simple and safe to operate is provided. The controlmeans 41 is mounted on the member 74 and is particularly shown inFigures 6, 7 and 8. It comprises a base 94 which carries a block 95,having a series of passages and valves. The fluid from the accumulator,or source of fluid supply, is admitted to the member 95 through pipe 96.

It passes through passage 97, Figure 6, and

thence through vertical passage 98 and short passage 99 to verticalpassage 100. In passage 100 is located a check-valve 101, Figure 7,which the fluid passes and enters chamber 102. It passes from chamber102 through passage 103 to valve chamber 104, which houses valve 105.When valve 105 is opened, the fluid passes down and through shortpassage 106 to pipe 81, which goes to the main cylinder. This valve 105is the first to be operated and by opening the same the fluid pressureis supplied to move the slidingdieholder in position to close the dies.Passage 97,'Figure 8, communicates by means of short passage 107 withvalve chamber 108,

After valve 109 has been opened and the gooseneck raised and intensifierapplied, the parts are in proper position to open the compressed airvalve and force the metal from the gooseneck into the dies. Figures 6, 7and 8 'show the parts in this position, and they are held there whilethe casting is being made. After the casting has been made, the partsmay then be returned to their normal position. The valve 109 is closedand valve 112 is opened. Passage 113 leads from chamber to chamber 114in which valve 112 is located. The fluid then passes into passage 115and thence to waste line 116. The valve 112 allows the pressure to berelieved, and the gooseneck lowered and intensifier withdrawn. After thethree valves have been opened and closed, the last valve 117 is opened.The valve chamberin which valve 117 is located is connectedby passage118, Figure 8, to the main cylinder feed line, and valve 117 opens intopassage 115, Figure 6, which leads to waste line 116, Figure 7.

Suitable means are provided to open andclose the valves in their propersequence. Shafts 119 and 120 are mounted in brackets 121 and 122 securedto member 95. The shaft 119 carries cams 123 and 124, and shaft 120carries cams 125 and 126. Rollers 127 mounted on bell-crank levers 128are held in contact with cams 123, 124, 125 and 126 by virtue of springs129 mounted on-studs 130, secured in brackets 131, in which the arms 128are pivoted at 132. The short arms of the bell-crank levers '128 carryadjustable set screws 133, which have sockets 134 in their ends forcooperating with valve-stems 135 on the valves 105, 109, 112 and 117.All the valves, except the check-valve 101, are provided withscrew-plugs 136, between which, plugs and valve members, are confinedsprings 137 for normally holding the valves in their closed osition.Suitable packing 138 is also provi ed for the valve-stems 135.

A large gear 139, Figure 8, secured on a shaft 140 having suitablebearings on the member 95, engages pinions 141 and 142 on the shafts 119and 120, respectively. On the outer end of shaft 140 is a crank-arm 143,havin a-handle 144. When crank 143 is turned in a clockwise direction,it. rotates pinions 141 and 142.- Referring to Figure 2, when the arm143 .is in the right-hand position or sition .A, an ofthe valves areclosed. Vhen the arm is moved to the central position, or position B,pinion 141-is rotated by gear 140 and cam 123 engages one of the rollers127 and opens valve 105. This allows the fluid actuating medium toenter- ..the main cylinder and move the sliding dieholder to close thedies. When the movement of the lever 143 is continued to its maximum"left-hand position, or the position shown in full lines in Figures 1 and2, cam 124 operates to open valve 109, and valve 105 is closed. Valve109 allows the fluid operating medium to raise the gooseneck and applytheintensifier. On the return of the lever toits normal position, thecams 125 and 126 open the valves 112, 117, respectively and the partsresume their normal position as previously described.

As previously stated, means are provided so that the gooseneck cannot beraised or the intensifier applied until the dies areclosed, and themeans will now be described. Referring particularly to Figures 1, 2 and3, an extension 145 from the member 74 has pivoted thereon a lever 146.The end 'of this lever is so positioned that itwill normallypreventmovement of the crank 143. This lever 146 must be removed from the pathof the crank 143 before said crank 143 can be moved. Suitable means maybe provided adjacent the control means for changing the position oflever 146, or, if the machine is being operated by two men, the helpermay shift lever 146 from the other side of the machine. This will insurethat neither the operator nor his helper will be in danger of havingsome part of their person near the moving parts of the machine. Thehandle 147 on the opposite side of the machine has rod 148, which ispivoted at 149 to lever 146. Spring 150 keeps lever 146 in a position tointerfere with movement of crank 143, except at such times as handle 147is pulled. A bell-crank lever 151 ispivoted on the extension 145. Onearm of this bell-crank lever interferes with the movement of crank 143when in its intermediate position or position B, and crank 143 cannot bemoved from position B unt il the arm of the bellcrank lever interferingtherewith has* been removed. This arm will not beremoved until thesliding die-holder has moved over and a closed the dies.

thus allowing the latter to be moved to the position for raising thegooseneck and applying the intensifier. A. spring 156, Figure 2,normally holds the bell-crank lever in position to interfere with themovement of crank 143. When crank 143 is being returned to its 1 initialposition for starting another cycle of movements, it latches pastbell-crank lever 151 and lever 146.

As previously mentioned, means are provided for adjusting the positionof member 74, to compensate for inaccuracies and to take care ofdifferent conditions under which the machine must work, including theframe or support 11 having slidingly mounted in it, at 157, a plate 158which has a rack 159 secured to its bottom central part. This rack 159is engaged by a pinion 160 mounted on shaft 161 supported in the frame11. Shaft 161 has an outer squared end 162 which may be engaged by awrench'or handle to rotate pinion 160, and thus provide for alongitudinal adjustment or movement of member 74. After being properlyset or adjusted, the member 74 is locked in position by bolts 163,Figure 1. Plate 158 carries strips 164 which engage grooves in member74. A threaded bolt 165, having a squared end 166 and lock nut 167-isutilized to move member 74 transversely and lock it in its properposition. A hydraulic sliprjoint connection 168, Figures 1 and 2,

may be provided in fluid line 40, so that said pipe 40 maybe readilylengthened or shortened when the machine is being adjusted.

A brief rsum of the operation of the machine will now be given: Most ofthe views show the machine in position with the dies together, thegooseneck raised, and the intensifier applied. The crank 143, in itsnormal or control, position, would be to the right in Figure 1. Bymoving it to its control position, the fluid actuated means has advancedthe sliding die-holder 69 and closed the dies. Moving the crank 143clockwise from its control position to the position shown in Figure 1,raises the gooseneck and applies the intensifier. The lever 60 is thenpulled down, the valve 55 is opened, and the compressed air enters thegooseneck and forces the metal into the dies. The crank 143 is thenturned in an anti-clockwise direction and the fluid, operating upon themechanism for holding up the gooseneck and applying theintensifier, isdiverted to the waste line and the gooseneck is lowered and theintensifier withdrawn while said crank is being moved back to itscontrol position.

Completing the movement of crank 143 to theleft, diverts the'fluid fromthe main cylinder bore and allows the dies to be separated and thesliding die-plate returned to its initial position. Ejector means, forejecting the finished casting are common and not thought necessary toshow, although such means are a part of our machine ,as constructed. The

parts have been omitted from the drawings to avoid confusion. Themachine is now ready for another cycle of operations.

Numerous changes in details of construction and arrangements of parts,may readily be made by one skilled in the art, without departing fromthe spirit of the invention, as set forth in the ap ended claims.

Having thus descri ed our invention, what we claim and desire to secureby Letters Patent is: p

1. A die-casting machine having, in combination, a stationary die and ashiftable die, a ram for actuating the shiftable die,,fluid actuatedmeans operating upon said ram tocause the same toposition the shiftabledie accurately relatively to the stationary die, additional means actingdirectly upon the ram to lock the shiftable die when positioned, and asingle means for controlling the action of both of the ram operatingmeans.

2. A die-casting machine having, in combination, a stationary die' and ashiftable die, a ram for actuating the shiftable die, fluid actuatedmeans operating. upon said ram to cause the same to position theshiftable die accurately relatively to the stationi ary die, a metalcarrier for supplying molten metal to the dies, fluid actuated means forshifting the carrier to obtain and deliver the metal to the dies,additionalfluid means for locking the shiftable die at the critical .aram for actuating the shiftable die, fluid actuated" means operatingupon said ram to cause the same to position the shiftable die accuratelyrelatively to the stationary die, auxiliary fluid actuated meansoperating directly upon said ram to hold the dies together, and a singlemeans for controlling t e action of both of the ram operating means.

' 4. A die-casting machine having, in combination, a stationary die anda shiftable die, a ram for actuating the shiftable die, fluid actuatedmeans operating upon said ram to cause the same to position theshiftable die accurately relatively to the stationary die, fluidactuated means operating parallel with the positioning means forretracting the shiftable die, and a single means for controlling theaction of both of the ram operating means. y a

5. A die-casting machine having, in combination, a stationary die and ashiftable die, .a ram for actuating the shiftable die, fluid actuatedmeans operating upon said ram to cause the same to position theshiftable die accurately relatively to the stationary die, a carrier forsupplymg molten metal to the dies, fluid means for forcing the metalfrom the carrier into the dies, means for locking the shiftable die atthe critical period, and

a single means for controlling the action of.

both of the ram operating means.

6. A die-casting machine having, in combination, a stationary die and ashiftable die, a ram for actuating the shiftable die, fluid actuatedmeans operating upon said ram to cause the same to position theshiftable die accurately relatively to the stationary die, a carrier forsupplying molten metal to the dies, fluid means for forcing the metalfrom the carrier into the dies, and a single controlling means for theram operating means and to control the time of action of themetal-forcing means, whereby the dies may be first accuratelyregistered.

7. A die-casting machine having, in combination, a stationary die and-'a shiftable die, a ram for actuating the shiftable die, fluidactuatedmeans operating upon said .ram to cause the same to position theshiftable die accurately relatively to the stationary die, a carrier forsupplying molten metal to theldies, fluid means for raising and loweringthe carrier, fluid means for forcing the metal from the carrier into thedies, and a single means for controlling the action of the ram and themetal forcing means so as to prevent the metal being forced into thedies until the latter are in register.

8. A die-casting machine having, in com-- bination, a stationarydie-holder, a sliding die-holder having a ram aflixetl thereto,cooperating dies carried by said holders, fluid means for actuating saidram to properly position said dies in relation toeach other, means forlocking the ram at the critical period and. a single meansforcontrolling the action of both of the ram operating means.

9. A die-casting machine having, in combination, a stationarydie-holder, a sliding die-holder, cooperating dies carried by saidholders, a ram to move said sliding dieholder toward said stationaryholder, fluid actuated means to move said ram, additional fluid actuatedmeans acting directly upon the ram for causing said sliding die-holderto retain its proper position, and fluid actuated means for controllingall the operations of said sliding die-holder.

10. A die-casting machine having, in combination, a stationary die, acooperative sliding die, a ram to move said sliding die toward saidstationary die, fluid means to move said ram, a chamber in which saidram' is housed and said fluid operates, and a plunger which is forcedinto said chamber after said ram has moved said slidin die.

11. In a die-casting machine, a 'pa1r of dies, a fluid actuated ram forforcing the dies together, an intensifying member in alignment withtional pressure for holding said dies together, and a single means forcontrolling .Said ram for applying addi the action of both of the ramoperating fluid actuated controlling means forboth said ram andintensifying member.

13. In a die-casting machine, a pair of dies, a fluid actuated ram forforcing the dies together, an intensifying member in alignment with saidram for applying additional pressure for holding said dies together,fluid actuated controlling means for both said ram and intensifier, ametal charging trap for supplying metal to said dies, and fluid actuatedmeans for raising and lowering said metal charging trap relatively tosaid dies.

14. In a die-casting machine, fluid actuated means for forcing the diestogether, an intensifying member for applying additional pressure forholding said dies together, fluid actuated means for operating saidintensifier, a metal charging trap for supplying metal to said dies,fluid actuated means for raising and lowering said metal charging traprelatively to said dies, and means for supplying compressed air to saidmetal charging trap to force the metal into said dies.

.15. In a die-casting machine, fluid actuated means for forcing the diestogether, an intensifying member for applying additional pressure forholding said dies together, fluid actuated means for operating saidintensifier,

a metal charging trap for supplying metal to -means for forcing the diestogether, an intensifying member for applying additional pressure forholding said dies together, fluid actuated means for operating saidintensifier,

a metal charging trap for supplying metal to said dies, fluid actuatedmeans for raising and lowering said metal charging trap relatively tosaid dies, a valved control member for operating in sequence said fluidactuated means for forcing the dies together, and said fluid actuatingmeans for operating the in tensifier, and raising and lowering saidmetal charging trap, and means cooperating with said valved controlmember so that said fluid actuated means for raising said metal char ingtrap cannot operate until said dies are,

closed.

17. In a die-castingmachine, fluid actuated means for forcing t e diestogether, an intensifying member for applying additional pressure forholding said dies together, fluid actuated means for operating saidintensifier, a metal charging trap for supplying metal to said dies,fluid actuated means for raising and lowering said metalchargingtraprelatively to said dies, means for supplying compressed I air tosaidmetal charging trap to force the metzl into said dies, and means forpreventing said compressed air from being supplied 10 until said metalcharging trap is properly positioned in relation to said dies.

18. A die-casting machine having, in combination, a metal carrier, apair of dies one of which is movable relatively to the other,

means for shifting the movable die relatively to its mate to close thesame to receive the metal from the carrier, means for driving the metalfrom the carrier into the dies, means for locking the movable die toprevent the latter means displacing it and means for controlling thedriving means to prevent the metal from being forced from the carrieruntil the latter is in proper position relatively to the dies.

19. A die-casting machine having, in combination, a metal carrier, apair 0 dies one of which is movable relatively to the other, means forshifting the movable die relatively to its mate to close the same toreceive the metal from the carrier, means. for driving the metal fromthe carrier into the dies, means for locking the movable die to reventthe latter means displacing it and uid means for controlling the actionof the driving means 5 until the carrier is in proper position and thedie-closing means has performed its functions. EDGAR N. DOLLIN- CONRADC. JACOBSON.

